The most productive teams I've seen (eg at Jane Street) rewrite things all the time, and still move faster than any "normal" teams I've seen. I remember when I

The most productive teams I've seen (eg at Jane Street) rewrite things all the time, and still move faster than any "normal" teams I've seen. I remember when I interned there over a decade ago, they were already on like the seventh? version of their incremental computing framework, and were building a new build system. But they were also incredibly effective at getting things done both on a per-engineer basis and in terms of making money.